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Earnings (Loss) per share - Schedule of Antidilutive Securities Excluded from Computation of Earnings (Loss) per Share (Detail) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-dilutive securities 6,578,407 18,966,242 6,578,407 18,966,242
Restricted Stock Units        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-dilutive securities 3,842,631 16,524,140 3,842,631 16,524,140
Warrants        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-dilutive securities 2,623,776 2,220,102 2,623,776 2,220,102
Stock Options        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-dilutive securities 112,000 222,000 112,000 222,000